Research on Loading and Unloading Resource Scheduling and Optimization of Rail–Road Transportation in Container Terminal Based on “Internet +” —for Ghana Container Port Development Planning
Table 1
Variables definition table.
Symbol
Definition
Symbol
Definition
Set of operations of loading or unloading containers, operation is different from operation .
Positive number that is large enough
Number of gantry cranes on a loading and unloading line
Set of operations of loading or unloading for gantry crane .
Total amount of loading and unloading operations
Total amount of loading and unloading operations for gantry crane
Original X-coordinate of container
Final X-coordinate of container
Original Y-coordinate of container
Final Y-coordinate of container
Original Z-coordinate of container
Final Z-coordinate of container
,
Unloading operation and loading operation , which are carried out at the same place on the train
,
Unloading operation and loading operation q, which are carried out at the same trailer
Length of container
Width of container
Width of trucks operation passageway
Width of loading/unloading line
The minimum height that the container bottom ascends when it was moved crosswise by lifting sling
Height of container
Height of railway flatcar floor
Height of truck floor
Safe distance between two gantry cranes
Distance that gantry crane trolley moves from to from operation to
The distance travelled by gantry crane when it completes the operation
The distance travelled by gantry crane trolley when it completes the operation
The distance travelled by lifting sling when it completes the operation
Speed of gantry crane
Speed of lifting sling when it ascends or descends with container
Speed of gantry crane trolley
The permitting time for operation of railway flatcars
Speed of lifting sling when it ascends or descends idly
The moment when the loading or unloading operation of gantry crane is started
The moment when the loading or unloading operation of gantry crane is finished
The moment when gantry crane starts operation
The moment when gantry crane completes operation
The scheduled arrival moment of the truck for operation
The time cost of that gantry crane finishes operation of container , and then moves to the start place of operation of container